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04-26-2018, 04:16 PM | #1 |
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Spark plug question
I was driving around town the other day and probably floored it a bit too much getting on the interstate. Heard a small pop, the engine started running rough and the check engine light came on. Once I was able to get off the road, I turned my engine off for a few minutes and it came back to life with the engine light off and the engine was running smoothly. I ran my OBD2 and got a fault code for a misfire in #5, which would either be bad plugs or a bad coil. I've only had my car for a year and hadn't changed the plugs yet, so I ordered 6 and started replacing them all today. When I got to #2, there was a small amount of crud at the tip, maybe oil? However, when I got to #3, there was quite a bit of oil covering the threads of the plug. I've never changed a set of plugs before, so I don't know if this is expected or not. I'm expecting not since none of the other plugs had the same problem. Any thoughts?
2008 BMW 135i coupe - N54 engine |
04-26-2018, 05:00 PM | #2 |
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Oil on/around the plugs can be due to a valve cover gasket leak. Was there any oil or grime in the spark plug tube?
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2011 BMW 135i ///M-Sport, DCT
Bilstein B12 kit, Dinan camber plates, M3 front control arms, Whiteline poly RSFB, MHD Stage 1, cp-e Charge Pipe, H&R Front sway bar, BMW performance diffuser |
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04-27-2018, 08:57 AM | #4 |
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Yep, sounds like the beginnings of a valve cover gasket leak
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2011 BMW 135i ///M-Sport, DCT
Bilstein B12 kit, Dinan camber plates, M3 front control arms, Whiteline poly RSFB, MHD Stage 1, cp-e Charge Pipe, H&R Front sway bar, BMW performance diffuser |
Appreciate
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